Water Treatment Filter with Antioxidant Coating
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Solution Overview
Problem
Current water treatment filters face challenges in maintaining hydrophilicity and chemical resistance, particularly when exposed to strong oxidizing agents like hypochlorite, leading to shortened filter life and increased maintenance costs.
Innovation Solution
A filter medium with a porous base material coated by a cross-linked hydrophilic polymer, where a high electron density part with π-electrons is covalently bonded to the polymer, directing hypochlorite attacks away from the main hydrophilic groups, thus enhancing oxidation resistance and maintaining hydrophilicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluororesin such as PTFE is used as a base material for a water treatment filter, then chemical resistance is improved, but hydrophilicity deteriorates
Solution Approach 1:
The invention uses a composite structure consisting of a fluororesin base material (PTFE) combined with a hydrophilic polymer coating layer. This composite approach allows the filter to simultaneously achieve the chemical resistance of fluororesin and the hydrophilicity of the polymer coating, resolving the contradiction between these two properties.
Solution Approach 2:
The invention applies local quality modification by coating only the surface of the fluororesin base material with a hydrophilic polymer. The base material retains its hydrophobic nature for chemical resistance, while the surface coating provides localized hydrophilicity for improved water permeability and anti-fouling properties.
2Ease of operation
If a hydrophilic polymer coating is applied to a fluororesin filter, then hydrophilicity is improved, but oxidation resistance deteriorates due to attack by hypochlorite
Solution Approach 1:
The invention introduces an intermediary substance - a phenolic antioxidant polymer - that acts as a mediator between the hydrophilic polymer coating and the hypochlorite oxidizing agent. This antioxidant layer absorbs and neutralizes the oxidative attack, protecting the hydrophilic coating from degradation while maintaining its water-permeable properties.
Solution Approach 2:
The invention applies beforehand cushioning by incorporating antioxidant polymers into the hydrophilic coating layer before exposure to hypochlorite. This pre-established protective mechanism cushions against future oxidative attacks, allowing the filter to withstand repeated washing cycles without degradation of the hydrophilic coating.
3Ease of operation
If hypochlorite is used for washing a water treatment filter, then biofouling removal is improved, but filter life deteriorates due to oxidation damage
Solution Approach 1:
The invention converts the harmful oxidative effect of hypochlorite into a beneficial protective mechanism. By incorporating antioxidant polymers into the coating layer, the filter utilizes the hypochlorite exposure to activate and demonstrate the antioxidant protection, thereby maintaining filter integrity and extending service life while still achieving effective biofouling removal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The filter medium exhibits prolonged life and reduced maintenance frequency, maintaining high water permeability and hydrophilicity even after exposure to hypochlorite, making it suitable for large-scale wastewater treatment applications.
Implementation Method 1
hypochlorite acts as a strong oxidizing agent and attacks the hydrophilic groups and the polymer backbone of a filter material
Implementation Method 2
the high electron density part having π-electrons, which is highly reactive to an electrophile, to a cross-linked hydrophilic polymer
Implementation Method 3
a cross-linked hydrophilic polymer coating layer which has a cross-linked structure
Implementation Method 4
the hydrophilic polymer in the cross-linked hydrophilic polymer is cross-linked with an aliphatic saturated hydrocarbon group
Implementation Method 5
the high electron density part is covalently bonded to the cross-linked hydrophilic polymer
Data Source
AI summary
The problem to be solved by the present invention is to provide a filter medium for a water treatment filter having contradictory characteristics, that is, hydrophilicity and chemical resistance, and a long life, and to provide the production method thereof. A filter medium for a water treatment filter according to the present invention is characterized in comprising a porous base material having a hydrophilic coating layer; wherein the hydrophilic coating layer has a cross-linked hydrophilic polymer and a high electron density part; a hydrophilic polymer in the cross-linked hydrophilic polymer is cross-linked with an aliphatic saturated hydrocarbon group which may contain one or more functional groups selected from a group consisting of an ether group, a hydroxy group and an amino group; the high electron density part has π electrons; and the high electron density part is covalently bonded to the cross-linked hydrophilic polymer.